[9] RFR (S): 8162101: C2: Handle "wide" aliases for unsafe accesses

[Vladimir Kozlov]

Seems fine.

Thanks,
Vladimir

On 8/24/16 6:55 AM, Vladimir Ivanov wrote:
> http://cr.openjdk.java.net/~vlivanov/8162101/webrev.00/
> https://bugs.openjdk.java.net/browse/JDK-8162101
>
> Improve detection of unique alias categories for unsafe accesses.
>
> Mixed (can_access_non_heap == true) and on-heap mismatched accesses have wide aliases and, hence, need memory barriers
> around them.
>
> TypeInstPtr::KLASS & TypeAryPtr::RANGE are not covered since GraphKit::make_load() doesn't produce correct LoadNode
> flavors for them (LoadKlassNode/LoadRangeNode).
>
> Testing: JPRT, RBT (hs-tier0-comp).
>
> Thanks!
>
> Best regards,
> Vladimir Ivanov